package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.MD5;
import cn.hutool.json.JSONUtil;
import common.ApplicationVariable;
import lombok.SneakyThrows;
import model.ResultData;
import util.DBUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;

/**
 *  注册功能接口
 */
@WebServlet("/reg")
public class RegServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType(ApplicationVariable.RESPONSE_CONTENT_TYPE);
        int state = 200;
        int data = -1; // 受影响的行数
        String msg = "未知错误";
        // 1. 得到并验证前端的参数
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        if(!StrUtil.isBlank(username) && !StrUtil.isBlank(password)) {
            // 2. 进行注册操作
            Connection connection = DBUtil.getConnection();
            String sql = "insert into userinfo(username,password) values(?,?)";
            PreparedStatement statement = connection.prepareStatement(sql);
            statement.setString(1, username);
            statement.setString(2, MD5.create().digestHex(password));
            data = statement.executeUpdate();
            DBUtil.close(null, statement, connection);
        } else {
            msg = "参数错误";
        }
        // 3. 将操作的结果返回给前端
        ResultData resultData = new ResultData();
        resultData.setState(state);
        resultData.setData(data);
        resultData.setMsg(msg);
        resp.getWriter().println(JSONUtil.toJsonStr(resultData));

    }
}
